Impaired sound radiation in plates with periodic tunneled Acoustic Black Holes
Impaired sound radiation in plates with periodic tunneled Acoustic Black Holes
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具有周期性隧道声学黑洞的板块中的声辐射受损
DOI：
10.1016/j.ymssp.2019.106410
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发表时间：
2020
影响因子：
8.4
通讯作者：
Li Cheng
中科院分区：
文献类型：
--
作者：
Tang Liling;Li Cheng
声学黑洞（ABH）效应为操纵轻质结构内的弯曲波提供了显著的可能性。然而，传统ABH结构的有效频率范围受到所谓的特征/截止频率的限制，只有在该频率以上才能系统地获得系统的ABH效应，这严重阻碍了实际应用。在本文中，板与周期性的隧道双叶片ABH的研究，以实现减少在低频范围内的特征频率以下的声辐射。在给出无限大ABH晶格能带结构的基础上，通过有限元分析，研究了具有四个ABH单元的有限板的振动和声辐射。结果表明，除了预期的ABH引起的好处在高频率与阻尼处理，它也可以在低频范围内，这是远远低于结构的特征频率绘制声学效益。结果表明，在ABH诱导的局部共振带隙内，所设计的板在没有附加阻尼处理的情况下表现出较低的声辐射。超声强度和波数分析证实，所观察到的现象是由于受损的声辐射效率由ABH引起的高能量本地化内的非活性的声辐射区域的板，旁边的结构波数和振动能量传输效应从超音速到亚音速组件时，比较均匀的板。
Acoustic Black Hole (ABH) effects offer remarkable possibilities to manipulate bending waves inside light weight structures. The effective frequency range of conventional ABH structures, however, is limited by the so-called characteristic/cut-on frequency, only above which can systematic ABH effects be systematically obtained, which seriously hampers practical applications. In this paper, plates with periodic tunneled double-leaf ABHs are studied to achieve reduced sound radiation in the low frequency range below the characteristic frequency. Upon showing the band structure of an infinite ABH lattice, the vibration and sound radiation of a finite plate with four ABH cells are investigated through FE analyses after experimental validations of the model. Results show that, apart from the expected ABH-induced benefit at high frequencies with damping treatment, it is also possible to draw acoustic benefit in the low frequency range, which is far below the characteristic frequency of the structure. It is shown that, within the ABH-induced locally resonant band gaps, the designed plates exhibit low sound radiation without additional damping treatment. Supersonic intensity and wavenumber analyses confirm that the observed phenomena are attributed to the impaired sound radiation efficiency generated by the ABH-induced high energy localization inside the inactive sound radiation regions of the plate, alongside a structural wavenumber and vibration energy transport effect from supersonic to subsonic components when comparing to a uniform plate.
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DOI：
10.1590/1980-5373-mr-2016-0877
发表时间：
2018-01
影响因子：
1.7
作者：
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DOI：
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影响因子：
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